Public Member Functions¶

virtual SoType getTypeId (void) const
virtual const SoNodekitCatalog * getNodekitCatalog (void) const
SoScale1Dragger (void)

Public Member Functions inherited from SoDragger
virtual void callback (SoCallbackAction *action)
virtual void GLRender (SoGLRenderAction *action)
virtual void getMatrix (SoGetMatrixAction *action)
virtual void rayPick (SoRayPickAction *action)
virtual void search (SoSearchAction *action)
virtual void write (SoWriteAction *action)
virtual void getPrimitiveCount (SoGetPrimitiveCountAction *action)
void setProjectorEpsilon (const float epsilon)
float getProjectorEpsilon (void) const
void addStartCallback (SoDraggerCB *func, void *data=NULL)
void removeStartCallback (SoDraggerCB *func, void *data=NULL)
void addMotionCallback (SoDraggerCB *func, void *data=NULL)
void removeMotionCallback (SoDraggerCB *func, void *data=NULL)
void addFinishCallback (SoDraggerCB *func, void *data=NULL)
void removeFinishCallback (SoDraggerCB *func, void *data=NULL)
void addValueChangedCallback (SoDraggerCB *func, void *data=NULL)
void removeValueChangedCallback (SoDraggerCB *func, void *data=NULL)
void setMinGesture (int pixels)
int getMinGesture (void) const
SbBool enableValueChangedCallbacks (SbBool newval)
const SbMatrix & getMotionMatrix (void)
void addOtherEventCallback (SoDraggerCB *func, void *data=NULL)
void removeOtherEventCallback (SoDraggerCB *func, void *data=NULL)
void registerChildDragger (SoDragger *child)
void unregisterChildDragger (SoDragger *child)
void registerChildDraggerMovingIndependently (SoDragger *child)
void unregisterChildDraggerMovingIndependently (SoDragger *child)
SbMatrix getLocalToWorldMatrix (void)
SbMatrix getWorldToLocalMatrix (void)
SbVec3f getLocalStartingPoint (void)
SbVec3f getWorldStartingPoint (void)
void getPartToLocalMatrix (const SbName &partname, SbMatrix &parttolocalmatrix, SbMatrix &localtopartmatrix)
void transformMatrixLocalToWorld (const SbMatrix &frommatrix, SbMatrix &tomatrix)
void transformMatrixWorldToLocal (const SbMatrix &frommatrix, SbMatrix &tomatrix)
void transformMatrixToLocalSpace (const SbMatrix &frommatrix, SbMatrix &tomatrix, const SbName &fromspacepartname)
virtual void setMotionMatrix (const SbMatrix &newmatrix)
void valueChanged (void)
const SbMatrix & getStartMotionMatrix (void)
virtual void saveStartParameters (void)
const SoPath * getPickPath (void) const
const SoEvent * getEvent (void) const
SoPath * createPathToThis (void)
const SoPath * getSurrogatePartPickedOwner (void) const
const SbName & getSurrogatePartPickedName (void) const
const SoPath * getSurrogatePartPickedPath (void) const
void setStartingPoint (const SoPickedPoint *newpoint)
void setStartingPoint (const SbVec3f &newpoint)
const SbViewVolume & getViewVolume (void)
void setViewVolume (const SbViewVolume &vol)
const SbViewportRegion & getViewportRegion (void)
void setViewportRegion (const SbViewportRegion &reg)
SoHandleEventAction * getHandleEventAction (void) const
void setHandleEventAction (SoHandleEventAction *newAction)
void setTempPathToThis (const SoPath *somethingclose)
virtual void grabEventsSetup (void)
virtual void grabEventsCleanup (void)
void workFieldsIntoTransform (SbMatrix &mtx)
void setFrontOnProjector (ProjectorFrontSetting newval)
ProjectorFrontSetting getFrontOnProjector (void) const

Public Member Functions inherited from SoInteractionKit
SoInteractionKit (void)
virtual SbBool setPartAsPath (const SbName &partname, SoPath *path)
virtual SbBool setPartAsDefault (const SbName &partname, SoNode *node, SbBool onlyifdefault=TRUE)
virtual SbBool setPartAsDefault (const SbName &partname, const SbName &nodename, SbBool onlyifdefault=TRUE)
SbBool isPathSurrogateInMySubgraph (const SoPath *path, SoPath *&pathToOwner, SbName &surrogatename, SoPath *&surrogatepath, SbBool fillargs=TRUE)
SbBool isPathSurrogateInMySubgraph (const SoPath *path)
virtual SbBool setPart (const SbName &partname, SoNode *from)

Public Member Functions inherited from SoBaseKit
SoBaseKit (void)
virtual SoNode * getPart (const SbName &partname, SbBool makeifneeded)
SbString getPartString (const SoBase *part)
virtual SoNodeKitPath * createPathToPart (const SbName &partname, SbBool makeifneeded, const SoPath *pathtoextend=NULL)
SbBool set (const char *namevaluepairliststring)
SbBool set (const char *partnamestring, const char *parameterstring)
virtual void doAction (SoAction *action)
virtual SoChildList * getChildren (void) const
void printDiagram (void)
void printSubDiagram (const SbName &rootname, int level)
void printTable (void)
virtual void addWriteReference (SoOutput *out, SbBool isfromfield=FALSE)
SbBool forceChildDrivenWriteRefs (SoOutput *out)

Public Member Functions inherited from SoNode
void setOverride (const SbBool state)
SbBool isOverride (void) const
void setNodeType (const NodeType type)
NodeType getNodeType (void) const
virtual SoNode * copy (SbBool copyconnections=FALSE) const
virtual SbBool affectsState (void) const
virtual void GLRenderBelowPath (SoGLRenderAction *action)
virtual void GLRenderInPath (SoGLRenderAction *action)
virtual void GLRenderOffPath (SoGLRenderAction *action)
virtual void pick (SoPickAction *action)
virtual void audioRender (SoAudioRenderAction *action)
virtual void startNotify (void)
virtual void notify (SoNotList *l)
uint32_t getNodeId (void) const
virtual void writeInstance (SoOutput *out)
virtual SoFieldContainer * copyThroughConnection (void) const

Public Member Functions inherited from SoFieldContainer
void setToDefaults (void)
SbBool hasDefaultValues (void) const
SbBool fieldsAreEqual (const SoFieldContainer *container) const
void copyFieldValues (const SoFieldContainer *container, SbBool copyconnections=FALSE)
SbBool set (const char *const fielddata)
void get (SbString &fielddata)
virtual int getFields (SoFieldList &l) const
virtual int getAllFields (SoFieldList &l) const
virtual SoField * getField (const SbName &name) const
virtual SoField * getEventIn (const SbName &name) const
virtual SoField * getEventOut (const SbName &name) const
SbBool getFieldName (const SoField *const field, SbName &name) const
SbBool enableNotify (const SbBool flag)
SbBool isNotifyEnabled (void) const
SbBool set (const char *fielddata, SoInput *input)
void get (SbString &fielddata, SoOutput *out)
virtual SbBool validateNewFieldValue (SoField *field, void *newval)
SbBool getIsBuiltIn (void) const
virtual void getFieldsMemorySize (size_t &managed, size_t &unmanaged) const
void setUserData (void *userdata) const
void * getUserData (void) const

Public Member Functions inherited from SoBase
void ref (void) const
void unref (void) const
void unrefNoDelete (void) const
int32_t getRefCount (void) const
void touch (void)
SbBool isOfType (SoType type) const
virtual SbName getName (void) const
virtual void setName (const SbName &newname)
void addAuditor (void *const auditor, const SoNotRec::Type type)
void removeAuditor (void *const auditor, const SoNotRec::Type type)
const SoAuditorList & getAuditors (void) const
SbBool shouldWrite (void)
void assertAlive (void) const

Static Public Member Functions¶

static SoType getClassTypeId (void)
static const SoNodekitCatalog * getClassNodekitCatalog (void)
static void initClass (void)

Static Public Member Functions inherited from SoDragger
static SoType getClassTypeId (void)
static const SoNodekitCatalog * getClassNodekitCatalog (void)
static void setMinScale (float newminscale)
static float getMinScale (void)
static void workValuesIntoTransform (SbMatrix &mtx, const SbVec3f *translationptr, const SbRotation *rotationptr, const SbVec3f *scalefactorptr, const SbRotation *scaleorientationptr, const SbVec3f *centerptr)
static void getTransformFast (SbMatrix &mtx, SbVec3f &translation, SbRotation &rotation, SbVec3f &scalefactor, SbRotation &scaleorientation, const SbVec3f &center)
static void getTransformFast (SbMatrix &mtx, SbVec3f &translation, SbRotation &rotation, SbVec3f &scalefactor, SbRotation &scaleorientation)
static SbMatrix appendTranslation (const SbMatrix &mtx, const SbVec3f &translation, const SbMatrix *conversion=NULL)
static SbMatrix appendScale (const SbMatrix &mtx, const SbVec3f &scale, const SbVec3f &scalecenter, const SbMatrix *conversion=NULL)
static SbMatrix appendRotation (const SbMatrix &mtx, const SbRotation &rot, const SbVec3f &rotcenter, const SbMatrix *conversion=NULL)
static void initClass (void)
static void initClasses (void)

Static Public Member Functions inherited from SoInteractionKit
static SoType getClassTypeId (void)
static const SoNodekitCatalog * getClassNodekitCatalog (void)
static void initClass (void)
static void setSwitchValue (SoNode *node, const int newVal)

Static Public Member Functions inherited from SoBaseKit
static SoType getClassTypeId (void)
static void initClass (void)
static const SoNodekitCatalog * getClassNodekitCatalog (void)
static SbBool isSearchingChildren (void)
static void setSearchingChildren (const SbBool newval)

Static Public Member Functions inherited from SoNode
static uint32_t getCompatibilityTypes (const SoType &nodetype)
static SoType getClassTypeId (void)
static SoNode * getByName (const SbName &name)
static int getByName (const SbName &name, SoNodeList &l)
static void initClass (void)
static void initClasses (void)
static uint32_t getNextNodeId (void)
static int getActionMethodIndex (const SoType type)
static void getBoundingBoxS (SoAction *action, SoNode *node)
static void GLRenderS (SoAction *action, SoNode *node)
static void callbackS (SoAction *action, SoNode *node)
static void getMatrixS (SoAction *action, SoNode *node)
static void handleEventS (SoAction *action, SoNode *node)
static void pickS (SoAction *action, SoNode *node)
static void rayPickS (SoAction *action, SoNode *node)
static void searchS (SoAction *action, SoNode *node)
static void writeS (SoAction *action, SoNode *node)
static void audioRenderS (SoAction *action, SoNode *node)
static void getPrimitiveCountS (SoAction *action, SoNode *node)

Static Public Member Functions inherited from SoFieldContainer
static void initClass (void)
static SoType getClassTypeId (void)
static void cleanupClass (void)
static void initCopyDict (void)
static void addCopy (const SoFieldContainer *orig, const SoFieldContainer *copy)
static SoFieldContainer * checkCopy (const SoFieldContainer *orig)
static SoFieldContainer * findCopy (const SoFieldContainer *orig, const SbBool copyconnections)
static void copyDone (void)

Static Public Member Functions inherited from SoBase
static void initClass (void)
static SoType getClassTypeId (void)
static void addName (SoBase *const base, const char *const name)
static void removeName (SoBase *const base, const char *const name)
static void incrementCurrentWriteCounter (void)
static void decrementCurrentWriteCounter (void)
static SoBase * getNamedBase (const SbName &name, SoType type)
static int getNamedBases (const SbName &name, SoBaseList &baselist, SoType type)
static SbBool read (SoInput *input, SoBase *&base, SoType expectedtype)
static void setInstancePrefix (const SbString &c)
static void setTraceRefs (SbBool trace)
static SbBool getTraceRefs (void)
static SbBool connectRoute (SoInput *input, const SbName &fromnodename, const SbName &fromfieldname, const SbName &tonodename, const SbName &tofieldname)
static SbBool readRoute (SoInput *input)

Public Attributes¶

SoSFVec3f scaleFactor

Public Attributes inherited from SoDragger
SoSFBool isActive

Public Attributes inherited from SoInteractionKit
SoSFEnum renderCaching
SoSFEnum boundingBoxCaching
SoSFEnum renderCulling
SoSFEnum pickCulling

Protected Member Functions¶

virtual const SoFieldData * getFieldData (void) const
virtual ~SoScale1Dragger (void)
virtual SbBool setUpConnections (SbBool onoff, SbBool doitalways=FALSE)
void dragStart (void)
void drag (void)
void dragFinish (void)

Protected Member Functions inherited from SoDragger
SoDragger (void)
virtual ~SoDragger (void)
SbVec2f getNormalizedLocaterPosition (void)
SbVec2s getLocaterPosition (void)
SbVec2s getStartLocaterPosition (void) const
void setStartLocaterPosition (SbVec2s p)
SbBool isAdequateConstraintMotion (void)
virtual SbBool shouldGrabBasedOnSurrogate (const SoPath *pickpath, const SoPath *surrogatepath)
void setCameraInfo (SoAction *action)
virtual void handleEvent (SoHandleEventAction *ha)
void transferMotion (SoDragger *child)
void setIgnoreInBbox (SbBool newval)
SbBool isIgnoreInBbox (void)
virtual void getBoundingBox (SoGetBoundingBoxAction *action)
void setActiveChildDragger (SoDragger *newchilddragger)
SoDragger * getActiveChildDragger (void) const
virtual void setDefaultOnNonWritingFields (void)
void updateDraggerCache (const SoPath *path)

Protected Member Functions inherited from SoInteractionKit
virtual ~SoInteractionKit ()
virtual void copyContents (const SoFieldContainer *fromFC, SbBool copyConnections)
virtual SbBool setPart (const int partNum, SoNode *node)
virtual SbBool readInstance (SoInput *in, unsigned short flags)
virtual SbBool setAnyPartAsDefault (const SbName &partname, SoNode *node, SbBool anypart=TRUE, SbBool onlyifdefault=TRUE)
virtual SbBool setAnyPartAsDefault (const SbName &partname, const SbName &nodename, SbBool anypart=TRUE, SbBool onlyifdefault=TRUE)
SbBool setAnySurrogatePath (const SbName &name, SoPath *path, SbBool leafcheck=FALSE, SbBool publiccheck=FALSE)
void connectSeparatorFields (SoSeparator *dest, SbBool onOff)

Protected Member Functions inherited from SoBaseKit
virtual ~SoBaseKit ()
virtual SoNode * addToCopyDict (void) const
SoGroup * getContainerNode (const SbName &listname, SbBool makeifneeded=TRUE)
virtual SoNode * getAnyPart (const SbName &partname, SbBool makeifneeded, SbBool leafcheck=FALSE, SbBool publiccheck=FALSE)
virtual SoNodeKitPath * createPathToAnyPart (const SbName &partname, SbBool makeifneeded, SbBool leafcheck=FALSE, SbBool publiccheck=FALSE, const SoPath *pathtoextend=NULL)
virtual SbBool setAnyPart (const SbName &partname, SoNode *from, SbBool anypart=TRUE)
void createNodekitPartsList (void)
void createFieldList (void)
virtual void createDefaultParts (void)
const SoNodekitParts * getNodekitPartsList (void) const
const SbList< SoSFNode * > & getCatalogInstances (void) const
void catalogError (void)
void countMyFields (SoOutput *out)

Protected Member Functions inherited from SoNode
SoNode (void)
virtual ~SoNode ()

Protected Member Functions inherited from SoFieldContainer
SoFieldContainer (void)
virtual ~SoFieldContainer ()

Protected Member Functions inherited from SoBase
SoBase (void)
virtual ~SoBase ()
virtual void destroy (void)
SbBool hasMultipleWriteRefs (void) const
SbBool writeHeader (SoOutput *out, SbBool isgroup, SbBool isengine) const
void writeFooter (SoOutput *out) const
virtual const char * getFileFormatName (void) const

Static Protected Member Functions¶

static const SoFieldData ** getFieldDataPtr (void)
static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)
static void startCB (void *f, SoDragger *d)
static void motionCB (void *f, SoDragger *d)
static void finishCB (void *f, SoDragger *d)
static void fieldSensorCB (void *f, SoSensor *s)
static void valueChangedCB (void *f, SoDragger *d)

Static Protected Member Functions inherited from SoDragger
static const SoFieldData ** getFieldDataPtr (void)
static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)
static void childTransferMotionAndValueChangedCB (void *, SoDragger *)
static void childValueChangedCB (void *, SoDragger *)
static void childStartCB (void *, SoDragger *)
static void childMotionCB (void *, SoDragger *)
static void childFinishCB (void *, SoDragger *)
static void childOtherEventCB (void *, SoDragger *)

Static Protected Member Functions inherited from SoInteractionKit
static const SoFieldData ** getFieldDataPtr (void)
static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)
static void readDefaultParts (const char *fileName, const char defaultBuffer[], int defBufSize)
static void fieldSensorCB (void *, SoSensor *)

Static Protected Member Functions inherited from SoBaseKit
static const SoFieldData ** getFieldDataPtr (void)
static const SoNodekitCatalog ** getClassNodekitCatalogPtr (void)

Static Protected Member Functions inherited from SoNode
static const SoFieldData ** getFieldDataPtr (void)
static void setNextActionMethodIndex (int index)
static int getNextActionMethodIndex (void)
static void incNextActionMethodIndex (void)
static void setCompatibilityTypes (const SoType &nodetype, const uint32_t bitmask)

Static Protected Member Functions inherited from SoBase
static uint32_t getCurrentWriteCounter (void)
static void staticDataLock (void)
static void staticDataUnlock (void)

Protected Attributes¶

SoSFNode feedback
SoSFNode feedbackActive
SoSFNode feedbackSwitch
SoSFNode scaler
SoSFNode scalerActive
SoSFNode scalerSwitch
SoFieldSensor * fieldSensor
SbLineProjector * lineProj

Protected Attributes inherited from SoDragger
SoSFNode motionMatrix

Protected Attributes inherited from SoInteractionKit
SoSFNode geomSeparator
SoSFNode topSeparator
SoFieldSensor * fieldSensor
SoSeparator * oldTopSep

Protected Attributes inherited from SoBaseKit
SoSFNode callbackList
SoChildList * children
SbBool connectionsSetUp

Protected Attributes inherited from SoNode
uint32_t uniqueId

Protected Attributes inherited from SoFieldContainer
SbBool isBuiltIn

Additional Inherited Members¶

Public Types inherited from SoDragger
enum ProjectorFrontSetting { FRONT, BACK, USE_PICK }

Public Types inherited from SoInteractionKit
enum CacheEnabled { OFF, ON, AUTO }

Public Types inherited from SoNode
enum NodeType { INVENTOR = 0x0000, VRML1 = 0x0001, VRML2 = 0x0002, INVENTOR_1 = 0x0004, INVENTOR_2_0 = 0x0008, INVENTOR_2_1 = 0x0010, INVENTOR_2_5 = 0x0020, INVENTOR_2_6 = 0x0040, COIN_1_0 = 0x0080, COIN_2_0 = 0x0100, EXTENSION = 0x0200, COIN_2_2 = 0x0400, COIN_2_3 = 0x0800, COIN_2_4 = 0x1000, INVENTOR_5_0 = 0x2000, COIN_2_5 = 0x4000, COIN_3_0 = 0x8000, INVENTOR_6_0 = 0x10000 }

Protected Types inherited from SoBase
enum BaseFlags { IS_ENGINE = 0x01, IS_GROUP = 0x02 }

Static Protected Attributes inherited from SoNode
static uint32_t nextUniqueId = 1
static int nextActionMethodIndex = 0

SoScale1Dragger::SoScale1Dragger (void)¶

Default constructor, sets up the dragger nodekit catalog with the interaction and feedback geometry.

Node kit structure (new entries versus parent class marked with arrow prefix):

CLASS SoScale1Dragger
-->'this'


      'callbackList'


      'topSeparator'


         'motionMatrix'


         'geomSeparator'
-->         'scalerSwitch'
-->            'scaler'
-->            'scalerActive'
-->         'feedbackSwitch'
-->            'feedback'
-->            'feedbackActive'

(See SoBaseKit::printDiagram() for information about the output formatting.)

Detailed information on catalog parts:

CLASS SoScale1Dragger
PVT   'this',  SoScale1Dragger  ---


      'callbackList',  SoNodeKitListPart [ SoCallback, SoEventCallback ]
PVT   'topSeparator',  SoSeparator  ---
PVT   'motionMatrix',  SoMatrixTransform  ---
PVT   'geomSeparator',  SoSeparator  ---
PVT   'scalerSwitch',  SoSwitch  ---


      'scaler',  SoSeparator  ---


      'scalerActive',  SoSeparator  ---
PVT   'feedbackSwitch',  SoSwitch  ---


      'feedback',  SoSeparator  ---


      'feedbackActive',  SoSeparator  ---

(See SoBaseKit::printTable() for information about the output formatting.)

SoScale1Dragger::~SoScale1Dragger (void) [protected], [virtual]¶

Protected destructor.

(Dragger classes are derived from SoBase, so they are reference counted and automatically destroyed when their reference count goes to 0.)

SoType SoScale1Dragger::getTypeId (void) const [virtual]¶

Returns the type identification of an object derived from a class inheriting SoBase. This is used for run-time type checking and 'downward' casting.

Usage example:

void foo(SoNode * node)
{


  if (node->getTypeId() == SoFile::getClassTypeId()) {


    SoFile * filenode = (SoFile *)node;  // safe downward cast, knows the type


  }
}

For application programmers wanting to extend the library with new nodes, engines, nodekits, draggers or others: this method needs to be overridden in all subclasses. This is typically done as part of setting up the full type system for extension classes, which is usually accomplished by using the pre-defined macros available through for instance Inventor/nodes/SoSubNode.h (SO_NODE_INIT_CLASS and SO_NODE_CONSTRUCTOR for node classes), Inventor/engines/SoSubEngine.h (for engine classes) and so on.

For more information on writing Coin extensions, see the class documentation of the toplevel superclasses for the various class groups.

Reimplemented from SoDragger.

const SoFieldData * SoScale1Dragger::getFieldData (void) const [protected], [virtual]¶

Returns a pointer to the class-wide field data storage object for this instance. If no fields are present, returns NULL.

Reimplemented from SoDragger.

const SoNodekitCatalog * SoScale1Dragger::getNodekitCatalog (void) const [virtual]¶

Returns the nodekit catalog which defines the layout of this class' kit.

Reimplemented from SoDragger.

SbBool SoScale1Dragger::setUpConnections (SbBool onoff, SbBool doitalways = FALSE) [protected], [virtual]¶

Sets up all internal connections for instances of this class.

(This method will usually not be of interest to the application programmer, unless you want to extend the library with new custom nodekits or dragger classes. If so, see the SoBaseKit class documentation.)

Reimplemented from SoInteractionKit.

void SoScale1Dragger::startCB (void * f, SoDragger * d) [static], [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoScale1Dragger::motionCB (void * f, SoDragger * d) [static], [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoScale1Dragger::finishCB (void * f, SoDragger * d) [static], [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoScale1Dragger::fieldSensorCB (void * d, SoSensor * s) [static], [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoScale1Dragger::valueChangedCB (void * f, SoDragger * d) [static], [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

void SoScale1Dragger::dragStart (void) [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Called when dragger is selected (picked) by the user.

void SoScale1Dragger::drag (void) [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Called when user drags the mouse after picking the dragger.

void SoScale1Dragger::dragFinish (void) [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

Called when mouse button is released after picking and interacting with the dragger.

SoSFVec3f SoScale1Dragger::scaleFactor¶

Continuously updated to contain the current vector of scaling along the X, Y and Z axes.

For the SoScale1Dragger, only the X component is used, the Y and Z components will always be equal to 1 (ie no scaling).

SoFieldSensor * SoScale1Dragger::fieldSensor [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.

SbLineProjector * SoScale1Dragger::lineProj [protected]¶

This API member is considered internal to the library, as it is not likely to be of interest to the application programmer.